Set environment (LANG, LC_MESSAGE, LC_ALL) before using ICU API.

Set environment (LANG, LC_MESSAGE, LC_ALL) before using ICU API.

In order to operate ICU (used for globalization) normally, "LANG" and "LC_ALL" environment variables must be set before using ICU API.
In case of application running, AppFW set that variable. But when preloading the dll in the candidate process,
those environment variables are not set.
As a result, CultureInfo is incorrectly generated and malfunctions.
For example, uloc_getDefault() returns en_US_POSIX, CultureInfo is set to invariant mode.

Additionally, to apply language setting from native to managed, terminate and recreate candidate process when system language setting is changed.

After applying this patches, launching performance is reduced by 15ms ~ 20ms.
That is because previous .net application is launched in invariant mode.
(In invariant mode, string-related operations are fast.)